How Can Bifacial Module Technology Boost Energy Generation and Yeilds?

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Mr. Sai Charan Kuppili, Technical Director, South Asia , Jinko Solar

High Energy Density is what benefits everyone on any ground mounted Solar PV Installations, which can be achieved by using High efficiency Solar PV technologies like Bifacial PV Modules. 

Bifacial Technology Module has got the advantage of absorbing both global horizontal irradiation on the front side of the module and diffused/reflected irradiation on the rear side of the module. Depending on the type of installation, location and albedo factor varies the range of gain in specific energy yield when compared to Mono Facial modules. 

Texture of ground surface, factors of albedo varies throughout the day and albedo follows the diurnal curve and makes the sensitivities of reflection getting fluctuated throughout the light day within the spectral wavelength. 

Jinko Solar has done an analysis with all possible ground textures within our Haining factory at China and noticed the gain of energy with Bifacial modules varies upto 19% and the same was ratified by 3rd party agencies. 

Out of available different models (dual glass / transparent back sheet) in Bifacial Modules, for tropical climatic zones like India, it is preferred to use transparent back sheet which always gets the benefit of resembling existing conventional Solar PV modules. 

Swan Bifacial Transparent back sheet modules has product warranty of 30 years due to high reliable characteristics of the materials being used with POE as encapsulant and PVF – Tedlar based back sheet with fluoric materials adding more value when compared to conventional encapsulant and back sheets. This even helps in obtaining low LCOE with the reduced economics of Capex & Opex calculations. 

Reduced linear degradation on Bifacial modules is one other advantage over Mono facial modules to have high specific energy yield on any specific year during the life of the plant. Acceptability on these Bifacial technologies is getting wide spread and acceptability across the globe and expected to capture the majority market share technology by 2025. 

Swan or Tiger Bifacial Modules ranging at power class 385-405 Wp or 450-470 Wp exhibits higher energy densities on the surface which has low soil moisture, in turn increases the reflectivity sensitivities of the soil to produce more energy from the rear side of the Bifacial module. 

Mr. Ishver Dholakiya, Managing Director, Goldi Solar

The energy output of a photovoltaic solar plant is closely linked to the efficiency of the solar modules. It is needless to mention that numerous designs and configurations are being developed and tried out to further enhance the output of the modules. One such configuration, which has demonstrated positive results is bifacial solar modules. Bifacial solar modules offer many advantages over traditional solar panels. Power can be produced from both sides of a bifacial module, increasing total energy generation. They are often more durable because both sides are UV resistant, and potential-induced degradation (PID) concerns are reduced when the bifacial module is frameless. Balance of system (BOS) costs are also reduced when more power can be generated from bifacial modules in a smaller array footprint.

Bifacial modules can be manufactured using either monocrystalline or polycrystalline cells. There are variety of factors which can boost the higher energy generation among the most critical factors to consider are module mounting height and albedo, or the fraction of light reflected by the surface. 

Hence, the efficiency of bifacial module for higher energy generation also depends on the reflective behavior of the surface underneath the module and the installation height of the solar power system. An optimal combination of reflective surface and the highest possible system height makes it possible to achieve an additional energy yield of up to 25-30 percent. The increased energy yield and long durability of bifacial glass-glass modules contribute to a further reduction in the cost of energy production for all applications.

Mr. Manish Gupta, Director, Insolation

Bifacial solar modules use direct and reflective sunlight to produce energy from the front and rear surfaces of the module. As a result, they achieve a higher yield. Until now, bifacial technology, which was developed in the 1970s, has had only a small market share due to high production costs. In September 2015, the Institute for Solar Energy Research Hamelin (ISFH) . The bifacial solar cell is a further development of the highperformance PERC cell. In contrast to the PERC cell, the bifacial solar cell has an opening in the screen-printed rear contact to allow light to reach the active region of the cell from the back. The full-area aluminum printing of the PERC cell has been replaced with an optimized grid, similar to the front contact.

Bifacial solar cells have the advantage of producing more energy by using reflective incidental light from the rear along with light from the front of the module. With the transparent rear sides, glass-glass modules therefore provide the ideal module technology for bifacial solar cells. A second glass plate on the rear of the module allows reflected sunlight to reach the cells from the back. In this way, individual modules generate higher yields. Embedding the cells in a glass composite protects them from environmental and mechanical influences. High durability and minimal degradation ensure a maximum service life. The new bifacial product profits from a mature technological process.

The transparent and active rear side of bifacial modules enables additional energy production. The “energy boost” of a bifacial PV system describes the increase in specific energy yield (kWh/kWp) of the bifacial module compared with a monofacial module in the same system. Direct or diffused light is reflected from the ground and a portion is scattered to the rear of the module. The amount of light that reaches the rear side largely depends on two factors: the albedo of the ground and the installation height of the module.

Researchers and module manufacturers have been developing bifacial cell and module technology for decades. The new process for manufacturing bifacial solar cells based on the PERC technology  makes the bifacial cell technology more cost-effective and suitable for industrial production. The bifacial module of this new generation, is available as a glass module with 60 bifacial cells or a glass/clear backsheet module with 72 bifacial cells generating power on both sides and additional energy yield. The size of this increase depends mainly on the reflective behavior of the surface underneath the module and the installation height of the solar power system. An optimal combination of reflective surface and the highest possible system height makes it possible to achieve an additional energy yield of up to 25 percent.The increased energy yield and long durability of bifacial glass-glass modules contribute to a further reduction in the cost of energy production for all applications.

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